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/* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.activiti.engine.impl.scripting;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
/**
* Factory to create {@link JuelScriptEngine}s.
*
*/
public class JuelScriptEngineFactory implements ScriptEngineFactory {
private static List names;
private static List extensions;
private static List mimeTypes;
static {
names = Collections.unmodifiableList(Collections.singletonList("juel"));
extensions = names;
mimeTypes = Collections.unmodifiableList(new ArrayList(0));
}
public String getEngineName() {
return "juel";
}
public String getEngineVersion() {
return "1.0";
}
public List getExtensions() {
return extensions;
}
public String getLanguageName() {
return "JSP 2.1 EL";
}
public String getLanguageVersion() {
return "2.1";
}
public String getMethodCallSyntax(String obj, String method, String... arguments) {
throw new UnsupportedOperationException("Method getMethodCallSyntax is not supported");
}
public List getMimeTypes() {
return mimeTypes;
}
public List getNames() {
return names;
}
public String getOutputStatement(String toDisplay) {
// We will use out:print function to output statements
StringBuilder stringBuffer = new StringBuilder();
stringBuffer.append("out:print(\"");
int length = toDisplay.length();
for (int i = 0; i < length; i++) {
char c = toDisplay.charAt(i);
switch (c) {
case '"':
stringBuffer.append("\\\"");
break;
case '\\':
stringBuffer.append("\\\\");
break;
default:
stringBuffer.append(c);
break;
}
}
stringBuffer.append("\")");
return stringBuffer.toString();
}
public String getParameter(String key) {
if (key.equals(ScriptEngine.NAME)) {
return getLanguageName();
} else if (key.equals(ScriptEngine.ENGINE)) {
return getEngineName();
} else if (key.equals(ScriptEngine.ENGINE_VERSION)) {
return getEngineVersion();
} else if (key.equals(ScriptEngine.LANGUAGE)) {
return getLanguageName();
} else if (key.equals(ScriptEngine.LANGUAGE_VERSION)) {
return getLanguageVersion();
} else if (key.equals("THREADING")) {
return "MULTITHREADED";
} else {
return null;
}
}
public String getProgram(String... statements) {
// Each statement is wrapped in '${}' to comply with EL
StringBuilder buf = new StringBuilder();
if (statements.length != 0) {
for (int i = 0; i < statements.length; i++) {
buf.append("${");
buf.append(statements[i]);
buf.append("} ");
}
}
return buf.toString();
}
public ScriptEngine getScriptEngine() {
return new JuelScriptEngine(this);
}
}
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